JP2004065736A - Liquid medicine injection apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid medicine injection apparatus in which the backflows of liquid medicines of a plurality of kinds to be injected to a subject are prevented. <P>SOLUTION: The subject and a plurality of syringes 201 and 202 are connected by a subject tube 223 and a plurality of syringe tubes 221 and 222, but when injecting the liquid medicine from one of the plurality of syringes 201 and 202 to the subject, the syringe tubes 222 and 221 connected to the other one of the syringes 202 and 201 is cut off such that the liquid medicine injected from one of the syringes 201 and 202 to the subject does not flow back to the other one of the syringes 202 and 201. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a drug solution injector for injecting a drug solution into a subject, and more particularly, to a drug solution injector for injecting a drug solution from a plurality of syringes to a subject.
[0002]
[Prior art]
At present, a CT (Computed Tomography) scanner used in a medical field can take a tomographic image of a subject by applying X-ray photography, and an MRI (Magnetic Resonance Imaging) apparatus uses a tomographic image of a subject by a magnetic resonance effect. Can be captured in real time, and the angio apparatus can capture a blood vessel image of the subject by applying radiography.
[0003]
When the above-described apparatus is used, a liquid medicine such as a contrast medium or a physiological saline may be injected into a subject, and a liquid medicine injection apparatus that automatically executes the injection has been put to practical use. Here, a conventional example of such a liquid injector will be described below with reference to FIG.
[0004]
The liquid injector 1 illustrated here includes a large number of interchangeable syringes 10 and one liquid injector 20, and up to two syringes 10 are mounted on the liquid injector 20. The syringe 10 includes one cylinder member 11 and one piston member 12, and the cylinder member 12 has a single hole 13 opened on the end face formed therein.
[0005]
The distal end surface of the cylinder member 11 is closed to form a hollow conduit portion 14 at the center, and the hole portion 13 communicates with the distal end of the conduit portion 14. A piston member 12 is slidably inserted into a hole 13 of the cylinder member 11, and a piston flange 15 and a cylinder flange 16 are formed on the outer periphery of the distal end of the piston member 12 and the cylinder member 11, respectively. .
[0006]
The chemical liquid injector 20 has one syringe holding member 21 and two syringe driving mechanisms 22. The one syringe holding member 21 has the cylinder members 11 of the two syringes 10 individually. Two holding recesses 23 are formed. Two syringe drive mechanisms 22 are individually arranged behind each of the two recesses 23, and these syringe drive mechanisms 22 hold and slide the piston member 12 of the syringe 10.
[0007]
The drug solution injector 1 also has a branch tube 30 in which the distal end of one subject tube 31 and the distal ends of two syringe tubes 32 are connected by a tube connecting member 33 as one tube connecting means. The ends of the two syringe tubes 32 of the branch tube 30 are individually connected to the conduit portions 14 of the two syringes 10. A catheter is connected to the distal end of one subject tube 31 of the branch tube 30 by, for example, an extension tube, and the catheter is connected to the subject (not shown).
[0008]
In the above-described configuration, in the conventional liquid injector 1, two types of liquids can be injected into the subject from two syringes 10 by one liquid injector 20. For example, a CT scanner is used. It is possible to inject a contrast medium into a subject from which a tomographic image is captured, and then boost with a physiological saline.
[0009]
[Problems to be solved by the invention]
However, in the above-described liquid injector 1, the subject and the two syringes 10 are simply connected by the branch tube 30. Therefore, when one of the two syringes 10 is driven to inject the drug into the subject, The chemical may flow back into the other syringe 10. In order to prevent such a backflow, a switching valve is built in the tube connecting member 33 of the branch tube 30, and a one-way valve is inserted into the syringe tube 32 of the branch tube 30 (shown in the drawing). Zu).
[0010]
However, when the switching valve is built in, the manual operation is complicated, and an erroneous operation that drives the syringe 10 connected to the closed syringe tube 32 may occur. In addition, in the liquid injector 1, in order to confirm that the subject tube 31 is properly connected to the subject, a small amount of blood may be inhaled from the subject with the syringe 10; Not possible with the inserted structure.
[0011]
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a drug solution injector which can easily inject a plurality of types of drug solutions into a subject and can prevent backflow of the drug solution. And
[0012]
[Means for Solving the Problems]
A drug solution injection device of the present invention is a drug solution injection device for injecting a drug solution into a subject from a syringe in which a piston member is slidably inserted into a cylinder member, and includes a subject tube, a plurality of syringe tubes, tube connecting means, and a syringe holding device. It has a member, a plurality of syringe driving mechanisms, a plurality of tube blocking mechanisms, and an interlocking control means.
[0013]
The subject tube has a distal end connected to the subject, and the plurality of syringe tubes have the ends individually connected to the plurality of syringes. The tube connecting means connects the distal end of the subject tube to the distal ends of the plurality of syringe tubes, and the syringe holding member detachably holds the plurality of syringes. The plurality of syringe drive mechanisms relatively move the cylinder member and the piston member to individually execute the injection of the drug solution into the plurality of syringes, and the plurality of tube shutoff mechanisms individually open and close the plurality of syringe tubes. . The interlocking control unit interlocks the operations of the plurality of tube shutoff mechanisms and the plurality of syringe drive mechanisms, and associates a syringe tube communicating only one with a syringe driving only one.
[0014]
Therefore, in the drug solution injection device of the present invention, the subject and the plurality of syringes are connected by the subject tube and the plurality of syringe tubes, but when the drug solution is injected from one of the plurality of syringes to the subject, the other The syringe tube connected to the syringe is shut off, so that the drug solution injected into the subject from one syringe does not flow back to the other syringe.
[0015]
The various means referred to in the present invention may be formed so as to realize their functions. For example, dedicated hardware for performing predetermined functions, a data processing device provided with predetermined functions by a computer program, and the like. , A predetermined function realized inside the data processing device by a computer program, a combination thereof, or the like.
[0016]
Also, various components referred to in the present invention do not need to be individually independent, and a plurality of components are formed as one member, and one component is a part of another component. It is also possible that some of the components overlap with some of the other components.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
[Configuration of Embodiment]
An embodiment of the present invention will be described below with reference to FIGS. Note that the same portions as those of the conventional example described above with respect to the present embodiment are denoted by the same names, and detailed description thereof is omitted.
[0018]
As shown in FIG. 2, a liquid injector 100 according to the present embodiment has an apparatus main body 102 mounted on an upper end of a stand 101, and an operation panel 104 and a liquid crystal display 105 mounted on the apparatus main body 102. I have. An arm 106 is mounted on a side of the apparatus main body 102, and an injection head 110 as a syringe holding member is mounted on an upper end of the arm 106.
[0019]
In the injection head 110, as shown in FIG. 1, two concave portions 112 are formed on the upper surface of a syringe holding member 111, and the cylinder members 211 of the first and second syringes 201 and 202 are individually formed in these concave portions 112. It is detachably held. The first syringe 201 contains a high-viscosity contrast agent as a drug solution, and the second syringe 202 contains a low-viscosity saline solution as a drug solution (not shown).
[0020]
At the rear of the injection head 110, first and second driving mechanisms 113 and 114, which are first and second syringe driving mechanisms, are built in. The first and second driving mechanisms 113 and 114 are provided with the first and second driving mechanisms 113 and 114, respectively. The piston members 212 of the second syringes 201 and 202 are individually held and slid.
[0021]
Also in the liquid injector 100 of the present embodiment, the branch tube in which the first and second tubes 221 and 222 as the first and second syringe tubes and the subject tube 223 are connected by the tube connecting member 224 as the tube connecting means. 220 connects the first and second syringes 201 and 202 to a subject (not shown).
[0022]
In addition, first and second shut-off mechanisms 115 and 116, which are first and second tube shut-off mechanisms, are provided at a front portion of the injection head 110, and the first and second shut-off mechanisms 115 and 116 are provided. The first and second tubes 221 and 222 are individually opened and closed.
[0023]
More specifically, as shown in FIG. 5, the first blocking mechanism 115 has a first holding member 121 and a first pressing member 122, and the second blocking mechanism 116 has a second holding member 123 And a second pressing member 124. The first holding member 121 is arranged at a position facing the first pressing member 122 via the first tube 221, and the second holding member 123 is facing the second pressing member 124 via the second tube 222. It is arranged in the position to be.
[0024]
However, the first pressing member 122 and the second pressing member 124 are integrally formed on the left and right ends of one pressing slider member 125, and the pressing slider member 125 is opened and closed by an opening / closing interlocking mechanism (not shown). Since it is slidably supported in the left-right direction, the opening and closing operations of the first and second blocking mechanisms 115 and 116 are interlocked so as to be opposite to each other.
[0025]
In the first and second pressing members 122 and 124, portions facing the first and second holding members 121 and 123 are formed as semicylindrical convex surfaces, and the first and second holding members 121 and 123 are formed. Has a semi-cylindrical concave surface at a portion facing the first and second pressing members 122 and 124.
[0026]
Further, as shown in FIG. 4, the liquid injector 100 of the present embodiment has an integrated control circuit 130 that is an interlocking control means. The integrated control circuit 130 includes an operation panel 104, a liquid crystal display 105, The drive motor 131, the second drive motor 132, the first cutoff sensor 133, the second cutoff sensor 134, the communication switching motor 135, and the like are connected.
[0027]
The first and second drive motors 131 and 132 are drive sources for individually operating the first and second drive mechanisms 113 and 114, and the communication switching motor 135 is a drive source for operating the open / close interlocking mechanism. Since the communication switching motor 135 is connected to the pressing slider member 125 of the opening / closing interlocking mechanism by, for example, a worm gear (not shown), the pressing slider member 125 is fixedly held at the position where the sliding movement has been performed. . The first and second cutoff sensors 133 and 134 include, for example, photo sensors (not shown) that detect the position of the pressing slider member 125, and individually detect the closing of the first and second cutoff mechanisms 115 and 116. .
[0028]
The integrated control circuit 130 is composed of a so-called microcomputer, and performs integrated control of each of the above-described units in accordance with the installed computer program, so that the first and second shut-off mechanisms 115 and 116 will be described later in detail. The operations of the first and second driving mechanisms 113 and 114 are linked to each other, so that the first and second tubes 221 and 222 for communicating only one and the first and second syringes 201 and 202 for driving only one correspond to each other. .
[0029]
In addition, as shown in FIG. 3, the liquid injector 100 of the present embodiment is used in the vicinity of the imaging unit 301 of the CT scanner 300, and is connected to the control unit 302 of the CT scanner 300 as necessary. The control unit 302 includes a computer system, controls the operation of the imaging unit 301, and displays a tomographic image.
[0030]
[Operation of Embodiment]
In the configuration as described above, the liquid injector 100 of the present embodiment can freely inject a contrast medium and a physiological saline solution, for example, into a subject to be imaged by the CT scanner 300. In this case, the worker connects the subject tube 223 of the branch tube 220 to the subject, and connects the first and second tubes 221 and 222 of the branch tube 220 to the first and second syringes 201 and 202.
[0031]
Then, the first and second syringes 201 and 202 are mounted in the concave portion 112 of the injection head 110 of the drug solution injection device 100, and the first and second tubes 221 and 222 are connected to the first and second shut-off mechanisms of the injection head 110. 115 and 116 are inserted.
[0032]
In such a state, for example, when injecting a contrast medium into the subject from the first syringe 201, the operator performs a predetermined operation on the operation panel 104 of the liquid injector 100. Then, as shown in FIG. 6, the integrated control circuit 130 that has detected this operation (Step S1) rotates the communication switching motor 135 forward until the second cutoff sensor 134 detects that the second cutoff mechanism 116 is closed (Step S1). Steps S2 and S3).
[0033]
In such a state, the integrated control circuit 130 operates the first drive motor 131 of the first drive mechanism 113 to inject the contrast medium into the subject from the first syringe 201 (step S4). By inputting a stop operation on the panel 104 or operating the first drive mechanism 113 to the set position, the first drive mechanism 113 is stopped to stop the injection of the contrast agent (step S5).
[0034]
Similarly, when injecting physiological saline into the subject from the second syringe 202, the integrated control circuit 130 that has detected a predetermined operation of the operation panel 104 and the like (step S6), and the first cutoff sensor 133 outputs the first cutoff mechanism 115 The communication switching motor 135 is rotated reversely until the closing is detected (steps S7, S8), and the second drive mechanism 114 is operated to inject physiological saline from the second syringe 202 to the subject (steps S9, S10). .
[0035]
[Effect of the first embodiment]
In the drug solution injector 100 of the present embodiment, the first and second syringes 201 and 202 are connected to the subject by the subject tube 223 and the first and second tubes 221 and 222 as described above. The contrast medium and the physiological saline can be freely injected into the subject from the two syringes 201 and 202.
[0036]
However, when the contrast medium is injected from the first syringe 201 into the subject, as shown in FIG. 5B, the second tube 222 connected to the second syringe 202 is shut off. Does not flow back into the second syringe 202.
[0037]
Similarly, when injecting physiological saline into the subject from the second syringe 202, the first tube 221 connected to the first syringe 201 is shut off as shown in FIG. The physiological saline in the syringe 202 does not flow back to the first syringe 201.
[0038]
In particular, since the first and second pressing members 122 and 124 and the first and second holding members 121 and 123 block the first and second tubes 221 and 222 with cylindrical convex and concave surfaces, respectively, it is more reliable. It is possible to prevent the backflow of the contrast agent or physiological saline.
[0039]
Moreover, in the liquid injector 100 of the present embodiment, since the one-way valve is not used to prevent the above-mentioned backflow, for example, the second syringe 202 is used to check whether the subject tube 223 is properly connected to the subject. It is also possible to inhale a small amount of blood from the subject. Also in this case, since the first tube 221 not used for inhalation is shut off, it is possible to prevent the contrast medium from being inhaled from the first syringe 201 to the second syringe 202.
[0040]
Further, in the liquid injector 100 of the present embodiment, the driving of the first and second syringes 201 and 202 and the opening and closing of the first and second tubes 221 and 222 are controlled automatically in conjunction with each other. In addition, no erroneous operation such as driving the first syringe 201 while the first tube 221 is shut off does not occur, and a complicated operation such as manually operating the switching valve is not required.
[0041]
Moreover, in the liquid injector 100 of the present embodiment, the first and second blocking mechanisms 115 and 116 are formed integrally, and when the first blocking mechanism 115 blocks the first tube 221, the second blocking mechanism 116 is When the second tube 222 is securely opened and the second shut-off mechanism 116 shuts off the second tube 222, the first shut-off mechanism 115 surely opens the first tube 221. The selective shutoff of the two tubes 221 and 222 can be reliably performed.
[0042]
[Modification of Embodiment]
The present invention is not limited to the above embodiment, and allows various modifications without departing from the gist of the invention. For example, in the above-described embodiment, the chemical liquid injector 100 to which two syringes 201 and 202 are attached is illustrated, but a chemical liquid injector (not shown) to which three or more syringes are attached can also be implemented.
[0043]
In the above embodiment, the first and second tubes 221 and 222 and the subject tube 223 are illustrated as being integrally connected by a separate tube connecting member 224. However, the first and second tubes 221 and 222 are connected to each other. It is also possible to form the subject tube 223 integrally.
[0044]
Further, in the above embodiment, one of the first and second tubes 221 and 222 and the subject tube 223 is not provided with a one-way valve. However, at least one of the first and second tubes 221 and 222 may have a one-way valve. is there. However, as described above, in order to check whether the subject tube 223 is properly connected to the subject, when a small amount of blood is sucked from the subject with the second syringe 202, one valve is provided only to the first tube 221. Preferably, it is built-in.
[0045]
In the above embodiment, the first and second shut-off mechanisms 115 and 116 are integrally formed to selectively shut off the first and second tubes 221 and 222. However, the first and second shut-off mechanisms are provided. It is also possible to form the mechanisms separately and operate them individually.
[0046]
In this case, the first and second tubes 221 and 222 can be selectively opened and closed as described above. For example, a state in which both the first and second tubes 221 and 222 are shut off is assumed to be normal. It is preferable to open one of the first and second tubes 221 and 222 corresponding only when one of the first and second syringes 201 and 202 is driven.
[0047]
Further, in the above embodiment, since the pressing slider member 125 of the opening / closing interlocking mechanism and the communication switching motor 135 are connected by a worm gear, when the communication switching motor 135 is stopped, the pressing slider member 125 is fixedly held. Although illustrated, for example, it is also possible to hold the pressing slider member 125 by using the communication switching motor 135 as a stepping motor, and to add a lock mechanism (not shown) dedicated to holding the pressing slider member 125. Is also possible.
[0048]
Further, in the above embodiment, the portions where the first and second pressing members 122 and 124 and the first and second holding members 121 and 123 block the first and second tubes 221 and 222 have cylindrical convex and concave surfaces. Although this has been exemplified, this may be a flat surface, an S-shape or the like.
[0049]
Further, in the above embodiment, the opening / closing interlocking mechanism is described as selectively blocking the first and second tubes 221 and 222 by the slidably supported pressing slider member 125. For example, as shown in FIG. It is also possible to selectively block the first and second tubes 221 and 222 with a pressing and rotating member 141 rotatably supported on a shaft.
[0050]
As shown in FIG. 8, the first pressing member 122 and the second pressing member 124 are slidably supported by a guide rail (not shown) or the like, and the first link member is attached to the crank member 144 of the opening / closing interlocking mechanism 143. 145 and the second link member 146 can be connected.
[0051]
In this opening / closing interlocking mechanism 143, the crank member 144 is formed in a disk shape, and the convex portion 147 formed on the disk surface comes into contact with the first and second cutoff sensors 148 and 149 formed of mechanical switches. With the structure, the selective interruption of the first and second tubes 221 and 222 can be reliably detected.
[0052]
Further, as shown in FIGS. 9 and 10, the first pressing member 161 and the second pressing member 162 are slidably supported in the same direction so as to be opposed to the first holding member 163 and the second holding member 164, respectively. It is also possible to engage the rotatable cam member 167 of the opening / closing interlocking mechanism 166 with the uneven surface of the board.
[0053]
Further, like the opening / closing interlocking mechanism 166, the convex portion 168 of the cam member 167 can be detected by the first cut-off sensor 133 and the second cut-off sensor 134, and the first pressing member 161 and the second pressing member can be detected. It is also possible to directly detect the protrusions 169 and 170 with the first shut-off sensor 133 and the second shut-off sensor 134.
[0054]
In this opening / closing interlocking mechanism 166, since the ends of the first and second pressing members 161 and 162 are located in the concave portions 173 on the board surface of the cam member 167, the blocking of the first and second tubes 221 and 222 is released. After one block is completed, the other block can be released and the backflow of the contrast agent or the like can be more reliably prevented.
[0055]
In addition, in the opening / closing interlocking mechanism 166, since the cam member 167 also has the concave portion 174 in which both the first and second pressing members 161 and 162 are located at the same time, the first and second tubes 221 and 222 can be formed as desired. The blocking can be released at the same time, and the loading of the first and second tubes 221 and 222 is easy.
[0056]
In order to recognize even such an operation, as described above, the protrusions 169 and 170 of the first pressing member 161 and the second pressing member 162 are directly detected by the first cutoff sensor 133 and the second cutoff sensor 134. However, it is also possible to provide a dedicated release detection sensor 176 for detecting a state in which both the first and second pressing members 161 and 162 are located in the concave portion 174.
[0057]
【The invention's effect】
In the drug solution injection device of the present invention, the subject and the plurality of syringes are connected by the subject tube and the plurality of syringe tubes. However, when the drug solution is injected from one of the plurality of syringes to the subject, another syringe is used. By blocking the syringe tube connected to, the liquid medicine to be injected into the subject from one syringe can be prevented from flowing back to the other syringe.
[Brief description of the drawings]
FIG. 1 is a perspective view illustrating an appearance of a main part of a drug solution injector according to an embodiment of the present invention.
FIG. 2 is a perspective view showing the overall appearance of the liquid injector.
FIG. 3 is a perspective view showing the appearance of a drug solution injector and a CT scanner.
FIG. 4 is a block diagram showing a circuit structure of the liquid injector.
FIG. 5 is a schematic plan view showing the operation of the main part of the liquid injector.
FIG. 6 is a flowchart illustrating a method for injecting a drug solution by the drug solution injector.
FIG. 7 is a plan view showing a main part of a first modified example.
FIG. 8 is a plan view showing a main part of a second modified example.
FIG. 9 is a perspective view showing a main part of a third modified example.
FIG. 10 is a rear view showing a main part of a third modified example.
FIG. 11 is a perspective view showing an appearance of a conventional chemical injection device.
[Explanation of symbols]
100 Chemical liquid injector 111 Syringe holding member 113 First drive mechanism 114 as a first syringe drive mechanism Second drive mechanism 115 as a second syringe drive mechanism First shutoff mechanism 116 as a first tube shutoff mechanism Second The second blocking mechanisms 121, 163, the first holding members 122, 161 The first pressing members 123, 164 The second holding members 124, 162 The second pressing members 125 The pressing slider members 133, 148 The first blocking sensors 134 , 149 second shut-off sensor 141 pressing / rotating members 143, 166 opening / closing interlocking mechanism 144 crank member 145 first link member 146 second link member 167 cam member 201 first syringe 202 second syringe 211 cylinder member 212 piston member 221 first No. 1 syringe syringe tube Over Bed 222 second tube connecting member is a second tube 223 patient tube 224 tube connecting means is a syringe tube

Claims (8)

A drug solution injector for injecting a drug solution into a subject from a syringe in which a piston member is slidably inserted into a cylinder member,
A subject tube having a tip connected to the subject,
A plurality of syringe tubes, the ends of which are individually connected to the plurality of syringes,
Tube connecting means connecting the ends of the subject tube and the tips of the plurality of syringe tubes,
A syringe holding member for detachably holding the plurality of syringes,
A plurality of syringe drive mechanisms that move the cylinder member and the piston member relative to each other to individually execute the injection of the drug solution into the plurality of syringes,
A plurality of tube blocking mechanisms for individually opening and closing the plurality of syringe tubes, and
Interlocking control means for associating a plurality of the tube shut-off mechanisms with a plurality of the syringe driving mechanisms in association with the syringe tube driving only one of the syringe tubes and the one driving only one of the syringes;
A liquid injector. The number of each of the syringe, the syringe tube, the syringe drive mechanism, and the tube shutoff mechanism is two,
The drug solution injection device according to claim 1, further comprising an opening / closing interlocking mechanism that interlocks and opposes the opening / closing operations of the two tube blocking mechanisms. A first pressing member which is displaceably disposed at a position where the first tube blocking mechanism presses the first syringe tube, and is opposed to the first pressing member via the first syringe tube; And a first holding member that is
A second pressing member that is displaceably disposed at a position where the second tube blocking mechanism presses the second syringe tube; and a second pressing member that faces the second pressing member via the second syringe tube. And a second holding member that is
3. The liquid injector according to claim 2, wherein the opening / closing interlocking mechanism includes a pressing slider member in which the first pressing member and the second pressing member are integrally formed and slidably supported. A first pressing member which is displaceably disposed at a position where the first tube blocking mechanism presses the first syringe tube, and is opposed to the first pressing member via the first syringe tube; And a first holding member that is
A second pressing member that is displaceably disposed at a position where the second tube blocking mechanism presses the second syringe tube; and a second pressing member that faces the second pressing member via the second syringe tube. And a second holding member that is
The chemical solution according to claim 2, wherein the opening / closing interlocking mechanism has a pressing / rotating member in which the first pressing member and the second pressing member are integrally formed and rotatably supported. Infusion device. A first pressing member slidably supported at a position where the first tube blocking mechanism presses the first syringe tube, and a first pressing member opposed to the first pressing member via the first syringe tube; And a first holding member that is
A second pressing member slidably supported at a position where the second tube shut-off mechanism presses the second syringe tube; and a second pressing member opposed to the second pressing member via the second syringe tube. And a second holding member that is
A crank member rotatably supported at a distal end thereof, a first link member connecting the tip of the crank member and the first pressing member, and a tip of the crank member. The liquid injector according to claim 2, further comprising: a second link member connecting the second pressing member. A first pressing member slidably supported at a position where the first tube blocking mechanism presses the first syringe tube, and a first pressing member opposed to the first pressing member via the first syringe tube; And a first holding member that is
A second pressing member slidably supported at a position where the second tube shut-off mechanism presses the second syringe tube; and a second pressing member opposed to the second pressing member via the second syringe tube. And a second holding member that is
The said opening-and-closing interlocking | linkage mechanism has the cam member which is formed with the unevenness | corrugation which the said 1st pressing member and the said 2nd pressing member engage, and is rotatably supported by the shaft. Chemical injection device. A first cutoff sensor that detects that the first syringe tube has been cut off, and a second cutoff sensor that detects that the second syringe tube has been cut off,
The interlocking control means activates the second syringe drive mechanism after the first cutoff sensor detects the cutoff and the first syringe drive mechanism after the second cutoff sensor detects the cutoff. The liquid injector according to any one of claims 2 to 6, which operates. The one-way valve which regulates movement of the medical fluid from the syringe to the subject is provided in at least one of the subject tube and the plurality of syringe tubes. Liquid injector.

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